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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '94f4e63c7b6b836f032e29874ec93e5c9a485a2bcc2a7e079712760c26cf3c9a' 
  AND token = 'WveGWnc/CMoJ/4zAmdff3p/XxK+LZUd179y9DXKpJ1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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