Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbb9be049129894bd360497d75d4f125d1fc3f67616d1073b67b23c575d0305' 
  AND token = '1FoaUFr0gcyrbd+Zjj2YvlFAWwJRRXGFo7rywpQEPHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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