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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '70539d645e4d9851f08eafa5056975d503dd2a843e46bc8e0681279637327743' 
  AND token = 'abFw4o7Ho3NcphzNioeQcEzshroYXSgEDDGdoRKzMAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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