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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e1afcda6d588734e7af09d80741ccb7c9c210ba44a21d11f03914e08647d8366' 
  AND token = 'EvAuNLI1+EuRoeEajjUF5MP+f0MO1BTebeOeKZegUD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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