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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd95d7345252e2ac6db9ddb6891b60085f8d82182398da8f6ad3f6362aeca20cb' 
  AND token = 'Qa11XFWQ4w3b8cxFp03/ekD0AZqGPnPUuJ+5NUNT/vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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