Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0b3cbd2e73b0a8ff29a24ea5af07f2ca4e9bb1a1d49f8279abe4340dd7a671' 
  AND token = 'POrRFVQzT46aCvynPlWa5HKR+ewp9d1FunX3Gse7EWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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