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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6106f37771ec12e5280edcb2bbb00b5abf59d1f3890704f1618bd2dddf3151c8' 
  AND token = 'r5IwbTcxaHnck9DrHZPNadcP8+aTC2iLMN2sxvf9rYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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