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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '949b2d3cebf9cd75414db7bbd0d4ed8d034c3551f3e039e366ef69e9e730f866' 
  AND token = 'M7YdrFowS9SjYM9/+TDTQ8RFrX9qILCPDNKrnmbNlJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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