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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3764ca623300c94647f545ab74d0916be8e67d330fd986b818ba0441edc00f6b' 
  AND token = '2xrii+fpe/gMTblYYK3pgjHXLwR6eUZ2yiry6ngTwTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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