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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '359958f8bf8202c8233cea3394de628303c74fad4a75e5d3a21888acd0a9768e' 
  AND token = 'WeGxKrdDCMnu2PpnU17Fh2jZ40uEtRxK9gbBsRYRF5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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