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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '98501cf435d7a17704d85283110b87d722c84a3ee52360eaf2ab1b41bae7f791' 
  AND token = 'Vo5x2LHp1mDNYEM8J5nE3QIctO8kGggDDAbMeU6BvmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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