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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e4665e25aca70f8bfdda58ec1561321e6a5c589b592960530429f11cacdb5e2f' 
  AND token = 't9q87X6jBTgJQopHl/Es4JZ4DJ7P1TlD2lrOW3nL81M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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