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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '772c3a2b285ce7af09c9e8aa9880d53eb910617034af882909793d08ab264a8c' 
  AND token = 'rjaCkYyulkjzAm3b2opykHylC+Mh4Iu2cp77JDPsuYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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