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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '122297d3a75a68803faa1db5cb85f682cad80cc590e9c59dc651dedb684c18cb' 
  AND token = 'dVlrlUAnm/HhUvqH2ycd+gM5IPsa8m/x2Fd3rkuBW5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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