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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9bbb7e8196c550e77b85354681e0a8891d990aad56426b8e9ebcbb50636e913f' 
  AND token = 'llAXa3ZBzpTt8FixPMM/I6D4wtIxNrPjFI9De77cBVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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