Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a7568ff135c56ccfa87049c7a02c750c07e0f20f6fb3b44b7b710e6450cf6c' 
  AND token = 'ZjfAY9l1+WrnDPOqNg6rDaSm+Ib745i9A4x2QO+JPXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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