Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8bfc7a54a234390c8c464e43d1b68c7b72da85e8708386391e732e81cea7494' 
  AND token = 'DmmaGinT4pNC7LTGbHWTMVsaaqjnqMvpqvzZZX3Ksds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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