Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0771e5e3d36464a67cde632b8f470ff4ac10bc67e58569b27a88ebcb5d7135c6' 
  AND token = 'UUR1Jbmz9pMBMXiW8uApa6KnzECQt2iUeJrl3CnjcaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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