Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcd51370261a4dfa0f274c9a2adfa09b0ef76a32b410edca94a7c833aef4d62' 
  AND token = 'zv+M+sL4NomJ/RpEaR4lnG3uxfXuZLOCdwmKKKVMaqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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