Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f07c1bb228c5b9e544a7365bd3b16f02cda4b135aa1753b7bb84becd40b997' 
  AND token = '59fjHDdCCZToHFF22dDifgLhorLhP9SMRTVMJzqWRj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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