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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6ac254e902d6db43e9a3289068a5ff066bd5f63b2e2990a169d112d8fd012715' 
  AND token = 'uZV1eToAMfZMUSg6ff7UpPQ79SRqfId/LiB1JFeMFNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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