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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e2931737dea3f7e314b86f64bd8888e64a5b086579e8991fed685a396066eaa0' 
  AND token = 'dup825FcfNtoL4rWFlFSX6Lm6i302cZy2JR3IDpleng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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