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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c16c204f8f59a846d5ef16fb62ab311a287d5466a9cacbe4854ec0d52b0753ba' 
  AND token = 'ZoLafY5LDItCaBibteKFds9PNO6UR6GtECWWe0WQMCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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