Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '144d2dcec7797cf05e8c360ee73d7401f49ccfb8d077c66abf38c5ea923559bd' 
  AND token = 'RqnfGLCW0D4S7n8FIEIuPctElQc/GYYEZAbkiTl+JY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}