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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f2d3c7e8bfd1a3ea25d2bc66e97b8d12f5ca98c0f5c3d0a59ed3ea24a3447239' 
  AND token = 'M0Xd0Y5csc3dK54kB4Q/7HsLCxJVT7DHuPtIC27cwTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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