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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fa48ad353ceaed77345adf99ca81c50d8ab52e8aff853daa96dae6963c5a8b37' 
  AND token = 'T3TGEK3t8gMu9yLOLDn/xWkiBWQ0UXcZ069e0YKQ1PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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