Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f51377d9a1e8d51dfc7ef93fd5d1dd1b707f7020e1ef475d0ac68aa145d1e77a' 
  AND token = 'DZ/FRt6IBmZ/VEtZikDJR/z8g2rAWMgzGVZs3ys/FLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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