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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8fb0e3a6d8e29904a0e09365f531ac48d29284219da62cc2a0a88dfbc08106ef' 
  AND token = '/Sy/HJ111oHACI1co7oXPVdEjjC3C4i4IqUwVv8Hj6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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