Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd899e4e51ab472ac5aa9aca4ec0c5be5b7ff0ccd8f14362ff93c44587e0e07' 
  AND token = '8ylL9TH253EnYWUomUGDCtcEj4+hrmBXI6Lv8SDpNT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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