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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a2479dd366aa4a5a4771de1f97f3c66eb36e085d218192937e74d090c400cfcd' 
  AND token = 'zgJBc7jKhATPA4ne3Rd+YMckEvaGWuDoWWKs+dis0N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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