Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d9b794076bf671bcfc67b4489dc91f38ddc2cf8ad890f73adc51968ef4d8dd' 
  AND token = '6W9TU0yPcOXLlxLtzOeuL7nCWL/qdKaMuSdfoiVKQww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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