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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b05adf9ae156562decb8716ea5bf3068a41c58d51de4f7f28a75e056f11d3f5d' 
  AND token = 'x39r2unhLhCZ2UblkXDjfcYpJyfXTJwK1nbaqx2Cb5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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