Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78dfa108d3f91666ab8b946e5636c51822eb148d66d251772d1ddac983622321' 
  AND token = 'bk+pTAQDyjTRXU0Apy9qrmxN2wK6DuiPIAnyykmP58w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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