Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee45c2d3a362a55d5f3955d294a4dce9ef36ef24a22724688aeff2eb6b2d8bd' 
  AND token = 't9KjSCiMUcXTLt4Ev/VoWvGi/cxT7vhVkaK6E2jfbsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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