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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '14d9df9e79d8aa51b326da88a271e671c57db4f24d4b6dbb65dd179ef3ce514e' 
  AND token = 'kISwaAQxUmh2YqpITmeQrRCqwvCZqMfWABQSO+eK0wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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