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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '91ddebae0d66ff08853905c85a22d474aaa124c47a9cd3e72a987e6f2cc8d5ca' 
  AND token = '7zuuTE16jND04R4rACmhoGFgh0FBWUB/aHn+rzedtEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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