Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5ec6b6f0c7abf49a296fd97a9a9816b68af5c6393c81ff133a46a4cc7d0901' 
  AND token = 'ANxK4BSc1uOQkElf9OBCqS4aEddJ1NSmGlSgkaGR+I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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