Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0f3c6479d7dc4cfcacb61a4bb23b78f78eda4a1d59c8d56658406d59ad12b1' 
  AND token = 'ONmp4JTTCHYYYrTe3KLDvtgvGqdDsQ29qouL5Rx02UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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