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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '281ccea43a0c50615a98253a9723e8980cd0e31ccb38fe2ab7bc41a781db7ccd' 
  AND token = 'f6BLa9ziNWT449Y91L4wKDIFjlUnAChYHskd18FjlbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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