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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e6c982a907ee5731ced3e7c75cf4eeae007825402e568c6e3de6d14269c7bfe' 
  AND token = 'xgAa56VYmZvOtaB2rP2Mq1+uNx/gTTVnanrkUd8yZd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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