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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0c9226ff155ebd77d1d3e78273a540e58d2dff56b39b2f95d82286059c1b2efd' 
  AND token = 'gktHrIca4+nfXBqJSrPEwiSVa3tTOJOCSzswt0asHUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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