Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f81d9138e84178d3f37730d1c23f20ffb7bbb202ed3ca47e5cacbe5b592ab442' 
  AND token = 'U5NSwyfhz8OXBA8WTcK/DumxDZCsfl5q9ClGvjk7iAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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