Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec28958866b50ee66eed2183109446795627b8442ece3aeea1eee3cbf226ee43' 
  AND token = 'UsgDUtSXZB+W2Kp44HdGj1MRTWh+q0FIgctBrkAXk4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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