Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918df5f02be5b39241d520027701a34bd6c75ce2d5e0dd09aa25e448f4a2438d' 
  AND token = '5ThMvhWM3E6C32ckVoGFEheGSNvPKitufY+9n+uPoS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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