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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e6cdb3f78bb47b2b8d5c3f23c04ab9d452d47c683b722d2f91e6b48fa894c4e0' 
  AND token = 'RYLrAt6QlVC4Ty7xoW/NxhXHQJ+4QT2CcQ51mdugfrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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