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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '84ea9d9b6b592dfdda6c5d903efebfab418f93c1518f17dd85620b6cd0667199' 
  AND token = 'yzuFk21gC6hrXZwkcMaps5PGIq8TjF44xg5tu6DGhm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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