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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd7d66270e57160b290452b6c3ce9d9063b6a92b9dde2bbd68b8afd40e8f02beb' 
  AND token = 'cXuppSBsDT52XuqicWgNuP7X9jRapj4hBV7zqmmRNr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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