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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '37ad82954a12a7e94cc40dea1fa484046cb8e51406f6446ae6aaf75521fa8241' 
  AND token = '1hu6dySwmR3zy9YgMsA6UKc1/y0bcnrY0ItVI9oFGPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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