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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3f6d71efaa55725aa87e92e1cc5a4a66374adf0387f5279a1729fdf3151e8cff' 
  AND token = '9LGBEjLqcrx1QnsjCIjnvjse/qz6k/RLl2KIefDrBTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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