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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6462a3c6f84b82f2d48e846bc3e1e16ba30df7b78c2a3512f74a3ca83cf928fe' 
  AND token = 'AeNcl6rhjHBmZZpAHV05CfkBD0PQ/kC/zOUP00rPnRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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