Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef268db75e2c0628558786ac6f57e71bf321702f0ddb790187845aba33686886' 
  AND token = 'dlGyXoaDSCGm3kToL3xRnmp2MSPpP+udp8OIa4teySQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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