Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39f115751d1bb1d329a0319f3952ca3754521b80e0dd715c85cd9ad3fb9ba75' 
  AND token = 'hWhX3As+Q+K5yNT6ODFhDiY4qTo8oC3KSsjXC8dKMF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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