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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '05aecc849fce7dd03b1be6f9121b7e0a6f9fd79c135408d97e0b4e3ad410be38' 
  AND token = 'EaKOFlkkqKuE7DNVZad+CcmCSur0xt8Wm4sLZUqsFrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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